I am a little at a loss in estimating output impedance--if it is too high, adjust R3 & R4 down while keeping the ratio about the same

3. Quiescent power dissipation on Q2, Q13 & Q14 is excessively high (230mW)--while it will work OK at 25°C, it will not work at 100°C--suggest increasing current mirror source resistor R11 to 2.2K--check 2N3904 thermal derating to see if this keeps it within max Tj limits

If you actually build this amp, make sure that Q13 & Q14 are thermally bonded together to make current mirror work over the temperature range.

4. Current mirror source resistor R10 is off by an order of magnitude--should be 3.6K

5. R12 must increase from 600K to at least 1M to satisfy input impedance spec--do this also to R13

7. The magnitude of R2 & R3 may be subsequently adjusted to bring open loop gain within specifications--my gut feel is that it will be close to spec--other than that, R4 may be adjusted, but it may not increase above 2K without affecting maximum output swing spec

This should now run in your simulator--you can tweak it from there--good luck!